Improvement in steam-boilers



W. B. MACK. STEAM BOILER.

No. 109,829. Patented Deo. 6, 1870.

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Letters Patent No. 109,829, dated December 6, 1870.

IMPROVEMENT IN STEAM-BOILERS.

The schedule referred-to in che mem Patent and making put ofthe um.

I,W1LLIAnr B. MACK, of Detroit, in the county .of Wayne and State of Michigan, have invented a certain Improvement inv Locomotive and Marine Boilers, of which the following is a specification.

The Nain-re and Object of the Invention.

The nature of my invention consists in the construction and arrangement of devices whereby a constant and equable circulation or current of the water in ,locomotive ormarine'boilers is obtained, carrying said water from the region of the', cylinderpart of the boiler furthest removed from the re, tothe lowest par't of the fire-box, or lthat part usually termed the leg -of the boiler; and

Its object is actively, to distribute the heatedwatcr equally and uniformly to all'points or parts of the boiler, thereby causing a more eren expansion of the boiler-plates, and greatly lessening their liability to rupture, as well as the liability and danger of explosion.

A Description of the Accompanying Drawing.

Figure A is a side view of a locomotive-boiler.

a a is a side view of fire-box iu the same.

Figure B is an eduction-pipe, entering the shell of the boiler, and carried through the mud-reservoir F to the point H, wherc'it branches olf to each side of the fire-box.

Figure C is the induction-pipe, connecting with or leading out of B at the point H, and ending at points D D, where it enters the ire-box.

Figure F is the mud-chamber or reservoir, with blow-off cock E attached below.

Figure G is the coupling or flange which connects of the pipe which runs through the mud-chamber F with that part of it which passes on to the' point H.

Figure H is the point where the pipe B is divided into the pipes C C. v

Letters i z' are the openings out of the boiler into the mud-reservoir, to admit the passage ofthe mud into the mud-chambcr without passing through the pipe B. l Letter K is a bracket or bruce to support the eduction-pipe firmly in position. A

Letter L is the cnt-ranccfpipe leading to the eduction-pipe B.

.Two arrows indicate the course ofthe water after its entrance into the @duction-pipe in 'ts onward and circulating course, so iar as the sam can thus be shown.

Letter J, extra opening into mud-chamber.

GeneraLDesca-ipt'ion. The eduction-pipe B is let into the lower side of the cylinder portion of the shell of theboiler at a point' furthest removed from the lire, the opening in the boiler being of larger diameter than that of the pipe, which is held 4irmly in place by braces, so as to admit a. free passage of water o r sediment around the same into the mud-chamber.

It is then carried from its point of connection with this part ofthe boiler to the point H, either inside the cylinder-part of the boiler and brought out at the point H or outside of and underneath the cylinder-part of the boiler, as shown in the drawing.

At this point H the vpipe B can be reduced in di ameter, and is carried to each side of the fire-box a a, where it is turned vinto and enters either at the side or bottom, and at one of its lowest points, and where the fire acts with its greatest intensity.

This entrance may be made at one point directly, or at more, if required. In the accompanying drawing it is represented as entering at two point-s D D ou each side of the rc-box.

In boilers whose shape will admit of vit thc entire conducting-pipe B and G C maybe carried tothe rbox a a, inside of the boiler-casings, and without coming-through the outside plates at any point.

Thewater, it will be seen, is carried by its own gravity ii'om the cylinder-part of the boiler furthest removed from the fire, through the pipe B, to the point H, where it branches off, following the divisions 1C; and entering the fire-box or shell a aat the points The coldest portion of the water in the boiler is foundat the mouth oi' pipe L, and the induction-pipe B is employed in a constant conveyance of this comparatively cold water to the fire-box a a, where the water is the hottest, the eect being, as already yintimated, to subject the entire body of water in the boiler, at some time, to that part of the Afire-box where theheat is most intense.

A mudchamber,.11`, with its point.L cast in one piece, is plovided with openings i i, so that the mud or sediment which is carried or may be carried along with this current of water to the points, as described, may'pass through them, t' i, andbe deposited in said mud-chamber F without entering eduction-ppe B.

The blow-off vcock E is placed at the bottom' of this mud-chamber F, in order that any or all mud or sediment which is thus received into the mud-- chamber may be blown oil and ejected whenever necessary.

The extra opening'J, from boiler int-o mnd-pipe,

is made so as to allow escape of water, displaced by mud or sand deposits, through s' i, or vice versa, as appears by arrows drawn for illustrating thecourse of the current of water through and out of mud-ohamber.

2 i i Claim. t substantially as and for the purposes hereinbeforeset forth.

WILLIAM B. MACK.

I claim as my invention-.- The construction and arrangement of the mudchamber- F.witl1`its pipe L and the `blow-oi` cock E, Witnesses: the openings i i and flange G, and'its combination HENRY H. SWAN, with the-.conducting or `simulating;pipes B and O, HENRY M. DUFFmLD, 

